Photographic apparatus.



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901,309. I Patented Oct. 13, 1908.

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UNITED STATES PATENT OFFTCE.

FREDERICK CRANDALL BRADBURN, JOHN HORSLEY TYLER, AND JESSE BARNEY LOW, OF ROCHESTER, NEW YORK, ASSIGNORS TO DAYLIGHT PHOTO SPECIALTY COMPANY, OF

ROCHESTER, NEW YORK.

PHOTOGRAPHIC APPARATUS.

Application filed April 22, 1907.

To all whom it may concern:

Be it known that we, FREDERICK C. BRAD- BURN, JOHN H. TYLER, and Jnssn B. Low, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Apparatus; and we do hereby declare the following to be a full, clear, and eX- act description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.-

This invention relates to improvements in hotographic apparatus and more particuarly to a developing tray for use in daylight,-the object of the invention being to simplify, cheapen and render most effectual the operation of such a developing tray.

With this object in view the lnvention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a pers ective view of a daylight developing tray em odying our improvements. Fig. 2 is a longitudinal sectional view, and Fig. 3 is a transverse sectional view.

1 represents a tray made of sheet metal and provided with a removable bottom 2, consisting of glass having such color as to be nonactinic. This bottom plate is held in a sheet metal frame 3 having its edges curled to receive aflange 4 on the sides and one end of the tray, thus permitting the glass bottom to be removed and readily replaced, and between the said metal frame and the walls of the tray any suitable packing may be located, said packing being preferably disposed in grooves 5 in flanges 6 projecting inwardly from the walls of the tray near the bottom thereof. Ledges 7 7 project inwardly from the side walls of the tray above their lower edges and a similar ledge 8 is located at the inner end of the tray. At the opposite end of the tray is a chamber 10 which will contain the developing solution when the tray is held vertically, and at the inner side wall of this chamber a ledge 11 is located and made to aline with the ledges 7 7. A series of posts or uprights 12 will be located between each ledge 7 and the flange 6 over the edge of the glass bottom, the lower ends of said posts being turned inwardly and constituting sup- Specification of Letters Patent.-

Patented Oct. 13, 1908.

Serial No. 369,531.

ports 13 for the photographic plate to be developed. The end posts of each series are provided with vertical flanges 14 which serve as stops for the plate and prevent longitudinal movement thereof when the tray is moved back and forth during the process of development.

A transfer frame 15 is located over the ledges above referred to and is adapted to slide in grooves 16 made in the side walls of the tray slightly above the said ledges and a considerable distance below the upper edges of the side walls of the tray. The transfer frame is made of sheet metal and receives a slide 17 of non-actinic material, said slide constituting the top of the developing chamber. The transfer'frame comprises two sheet metal members 18, 19, which are spaced apart along their inner edges to form guideways to receive the non-actinic slide and said members are secured together at their outer edges.-

The side edges of the transfer frame are preferably made with beads 20 to move in the grooves in the side walls of the tray and the forward end of the transfer frame may also be provided with a bead 21 to abut against the inner wall of the chamber 10. The inner end of the transfer frame is made with a depending flan e 22 which abuts against the front end walf of the tray and effects a light seal. The opposite end of the transfer frame is made with a depending lip 23 to abut against a flange 24 at the inner end of the tray to prevent the complete removal of the transfer frame. A strip 25 extends transversely across the slide 17 at a point'in proximity to its forward end, said forward end of the slide being permitted to enter between the sheet metal members of the transfer frame at the forward end of the latter and the strip 25 being made to abut against the end of the frame so as to constitute a stop for the slide. This strip 25 also cooperates with the other end of the frame to form a stop which prevents the complete removal of the slide from the frame.

While it may be desirable for amateur work, to make the bottom of the tray and the slide of the transfer frame of colored transparent material, still for the use of the expert, the bottom of the tray and the slide of the transfer frame may be made of metal and therefore opa us. In such case, the treatment of the p ate in the developing solution would be properly timed by the expert.

In operating the device, a plate holder containing a plate which has been exposed, is placed upon the transfer frame between the side walls of the tray. The shutter of the plate holder is then withdrawn so as to permit the plate to drop upon the slide 17 in the transfer frame. The slide 17 may now be withdrawn so as to permit the plate to become deposited into the developing chamber of the tray, after which the slide 17 will be restored and the plate holder removed. The plate with the tray may now be developed by moving the tray so as to cause the developing solution to flow over the sensitized plate.

Having fully described the invention what we claim as new and desire to secure by Letters-Patent, is,-

1. A developing tray having sheet metal walls provided with grooves forming guideways and a transfer frame disposed between said walls below the upper edges thereof and movable in said grooves in the sheet metal walls of the tray, and a slide movable in said frame.

2. A develooing tray having sheet metal walls provided with grooves and having a non-actinic bottom, and a movable transfer frame disposed between said side walls below the upper edges thereof and movable in the grooves in said walls, a non-actinic slide movable in said frame, and a stop preventing the complete removal of said slide.

3. The combination with a developing tray provided with a non-actinic bottom and with guide-ways in its side walls below the upper edges thereof, of a metallic transfer frame having its side edges movable in said guideways and a non-actinic slide movable in said frame.

4. The combination with a tray provided with a non-actinic bottom and having guideways in its side walls, of a metallic frame movable in said guideways and provided interiorly with guideways, a non-actinic slide movable in the guide-ways in said frame, and a stop secured to said slide and adapted to engage the ends of said frame.

5. The combination with a develooing tray having a non-actinic bottom and having guideways in its side walls, of a metal frame movable in said guideways, a stop depending from said frame and adapted to engage an end wall of the tray, and a non-actinic slide movable in said frame.

6. The combination with a metal tray and a non-actinic bottom, of a metal frame removably connecting said bottom to the walls of the tray, a transfer-frame movable between the side walls of the tray, and a nonactinic slide movable in said last mentioned frame and constituting the top of the developing chamber.

7. The combination with a developing tray having a non-actinic bottom, of ledges projecting inwardly above the bottom of the tray, posts at the ends of said ledges, a flange at one edge of each of said posts and constituting stops for a plate during the development thereof, a movable frame over sald ledges and a non-actinic slide mounted in said frame and constituting the top of the developing chamber.

8. The combination with a develo ing tray provided with guideways in its we is below the upper edges thereof, of a transfer frame movab e in said guideways and disposed wholly below the upper edges of the walls of the tray, and a slide movable in said frame and constituting the top of the developing chamber, the bottom of said chamber being formed by the bottom of the tray.

In testimony whereof, we have signed this specification in the presence of two subscribing witnesses.

Witnesses:

JOHN CORNELIUS CooK J WILLIAM B. PLAss. 

